My 12 Pro Max seems to have a blue shift more at the top than bottom of the screen, so some pure color screens seem a tad blower on top and a bit warmer on bottom. Every OLED I have ever had on everything from iPhone to 77-inch LG TV has shown some degree of this color shift from one side to the other. It is endemic to the technology, it seems, and no display is ever truly perfect. until you become so used to it that the imperfections become invisible. I am still at that early stage of wondering if it will become invisible to me. The screen lottery is a special kind of obsessive hell I have fallen into since the days of CRTs that always had some uniformity issues.